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is a significant concern for physicians. Central' F) \9 S- \( l! L7 U6 o
precocious puberty (CPP), which is mediated
* b' `8 n' x4 i, ~through the hypothalamic pituitary gonadal axis, has( {9 r: V2 [6 @
a higher incidence of organic central nervous system, O& M+ a2 O( S i- j, L5 f
lesions in boys.1,2 Virilization in boys, as manifested- v$ d. e1 S; P, Q, j
by enlargement of the penis, development of pubic
0 L) d# W/ r+ @! {8 h1 Q) {! Qhair, and facial acne without enlargement of testi- ^8 U8 v7 N* t" f' k0 S T: j
cles, suggests peripheral or pseudopuberty.1-3 We
9 ^" m/ l( F8 t9 D4 freport a 16-month-old boy who presented with the
! V! E+ v% l! P8 |: S2 venlargement of the phallus and pubic hair develop- x H* ?7 C" p! y0 j; } R
ment without testicular enlargement, which was due
) g2 F1 @% D# } O0 x D1 pto the unintentional exposure to androgen gel used by! t+ L7 {+ L) g; m+ O7 Z9 }+ Z
the father. The family initially concealed this infor-( K% T) C4 L7 U9 B
mation, resulting in an extensive work-up for this! ]$ J# Y4 M9 L& S& m: ^
child. Given the widespread and easy availability of i) X0 ^6 S; b% P- ]
testosterone gel and cream, we believe this is proba-
% H3 q3 k) N! Z6 B" G1 P0 pbly more common than the rare case report in the* H/ C9 P3 N. }" o
literature.4
8 m+ T- ]7 B/ a7 F; J- KPatient Report* r: B0 Z/ e& z3 P- i' ]
A 16-month-old white child was referred to the9 r+ w, t2 K: o* k; s
endocrine clinic by his pediatrician with the concern/ _" N# E1 Z* c. t! t
of early sexual development. His mother noticed
' f; n d- {2 klight colored pubic hair development when he was
/ k& }' ~7 \: o7 q( `From the 1Division of Pediatric Endocrinology, 2University of# J$ n6 G* Z8 `: f. u
South Alabama Medical Center, Mobile, Alabama.
; j. v' ?1 y( {* i& X" SAddress correspondence to: Samar K. Bhowmick, MD, FACE,- L- k5 l8 c) v( m8 ^8 u
Professor of Pediatrics, University of South Alabama, College of0 |5 W- H, P" G7 j S
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;2 d4 L6 j1 A: a+ w7 q7 D( G' V
e-mail: [email protected].6 K( l( i' I5 \) O1 L+ q
about 6 to 7 months old, which progressively became
& i+ m5 o1 V. d2 V% i- I0 K$ Tdarker. She was also concerned about the enlarge-# e# D9 r1 v3 k! V
ment of his penis and frequent erections. The child
7 e b }7 L$ W8 r5 V3 Hwas the product of a full-term normal delivery, with
8 @1 [6 Y& |) c6 V& Z2 Za birth weight of 7 lb 14 oz, and birth length of6 s% O+ L. K3 s. [! ?
20 inches. He was breast-fed throughout the first year
- Y* ^) p( x( o% U$ p- P9 kof life and was still receiving breast milk along with
# ^5 h# V6 V. u( R7 ysolid food. He had no hospitalizations or surgery,
& g! l% d. `7 M3 o5 wand his psychosocial and psychomotor development/ D: j& V# r% n3 W
was age appropriate.+ A5 L4 d1 D) d/ R# O" b. u$ W
The family history was remarkable for the father,
) N8 R+ @# ?) { [who was diagnosed with hypothyroidism at age 16,
2 V! A3 ~3 g& n' R/ [" E/ ^which was treated with thyroxine. The father’s4 ^ d. j7 @0 M. V; C
height was 6 feet, and he went through a somewhat- `: q& Z% c# o- \" C$ ?
early puberty and had stopped growing by age 14.
5 ~( _4 g* q' J" @( C/ hThe father denied taking any other medication. The
* _. I9 Q( T4 [4 {7 e9 wchild’s mother was in good health. Her menarche; R/ @3 X+ \ g* A
was at 11 years of age, and her height was at 5 feet
# c) @6 N3 Q. q$ \5 inches. There was no other family history of pre-. |, D1 ?4 [5 e* W
cocious sexual development in the first-degree rela-
+ \! t) _8 ^. o/ i( }6 \. gtives. There were no siblings.
% }. |; I; b3 m- D* rPhysical Examination$ |. E X$ ]% ~( D! t+ |
The physical examination revealed a very active,
- c8 t4 J2 X& L& gplayful, and healthy boy. The vital signs documented- v3 c) t' ^1 R7 D' f- e1 x
a blood pressure of 85/50 mm Hg, his length was
' C* i; K5 ]1 w- H2 o: Q( G2 c90 cm (>97th percentile), and his weight was 14.4 kg% |4 ]' c4 C/ d$ V, X2 b6 x, Z
(also >97th percentile). The observed yearly growth: I% w, {3 j) _, y7 C
velocity was 30 cm (12 inches). The examination of
d5 d( o; g3 H; G, D' a1 o# t9 _- z$ P0 rthe neck revealed no thyroid enlargement.$ L4 q, e8 R3 I( z4 Z
The genitourinary examination was remarkable for2 \ x( a3 h# H5 L% U2 t3 z8 h6 [+ a
enlargement of the penis, with a stretched length of! G/ R6 {; t! _5 l6 z/ H& C; W
8 cm and a width of 2 cm. The glans penis was very well0 _' _7 S- j8 U4 S, U' Z) O
developed. The pubic hair was Tanner II, mostly around5 m# \) d+ U: W
540
5 j3 @1 \& `0 }' `$ r" Fat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from! {/ z* G) z5 M, X
the base of the phallus and was dark and curled. The% F$ |& s, {* z. H5 D H
testicular volume was prepubertal at 2 mL each.+ q4 J) ]2 G7 |; T) E A6 Z$ H1 ?* _$ M
The skin was moist and smooth and somewhat6 F2 S* y7 L3 u/ I7 J, a" _6 ]
oily. No axillary hair was noted. There were no
$ u5 M; i) ]* p* ]1 |abnormal skin pigmentations or café-au-lait spots.
! b/ z$ n9 \. h( e! ] uNeurologic evaluation showed deep tendon reflex 2+1 b; ]4 U$ x: r( B
bilateral and symmetrical. There was no suggestion
: |% G8 _2 a A; s7 D7 Cof papilledema.
1 B; H. \) B. u& l& h: bLaboratory Evaluation
( V! u2 B% J' G/ K! C) uThe bone age was consistent with 28 months by1 k7 A. n7 r9 J, @1 Q( U5 w
using the standard of Greulich and Pyle at a chrono-' `( ]- f! q$ X, D
logic age of 16 months (advanced).5 Chromosomal
9 H& H. ?$ i# E# d$ q6 }/ f3 kkaryotype was 46XY. The thyroid function test
9 b- Y4 v( p6 `2 l8 r& y% Sshowed a free T4 of 1.69 ng/dL, and thyroid stimu-" H* g9 I0 g% J5 w% {5 C9 p
lating hormone level was 1.3 µIU/mL (both normal).7 `/ a! n5 S2 W g
The concentrations of serum electrolytes, blood
1 W* {4 W4 D( ourea nitrogen, creatinine, and calcium all were
% R* J* u3 g0 c! l; [( t" kwithin normal range for his age. The concentration- v) g. C# h- F0 E' \; K L
of serum 17-hydroxyprogesterone was 16 ng/dL
4 C7 Q7 C8 F! v' e. N) O(normal, 3 to 90 ng/dL), androstenedione was 20
& J9 v! B% X/ X- E/ g2 S r# ong/dL (normal, 18 to 80 ng/dL), dehydroepiandros- [5 Q; \4 i7 n% ?
terone was 38 ng/dL (normal, 50 to 760 ng/dL),
1 d4 h+ e- l- } g- {$ v cdesoxycorticosterone was 4.3 ng/dL (normal, 7 to1 E# [% @; V1 r' B
49ng/dL), 11-desoxycortisol (specific compound S)
& W0 J/ L& C- L8 y. d ~was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
4 k, s- Y* }7 _6 {& Itisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
( o% m$ f/ E7 B3 }testosterone was 60 ng/dL (normal <3 to 10 ng/dL),6 w, p4 f' X. D& P0 s S# l1 d
and β-human chorionic gonadotropin was less than
, L" d6 `( U& W0 G3 X5 mIU/mL (normal <5 mIU/mL). Serum follicular$ c+ x/ A: E0 O4 N6 u
stimulating hormone and leuteinizing hormone" t3 c6 ~7 \* Y7 U- L, O8 r9 k6 g5 X
concentrations were less than 0.05 mIU/mL
* Q; n _3 k# O! A(prepubertal).
0 ^' x" v0 t+ O8 u9 w4 Q; e# d2 hThe parents were notified about the laboratory2 |: ]3 ? A1 Y, o( w0 Z
results and were informed that all of the tests were, a# ^/ n8 m4 L9 j5 U* e. g
normal except the testosterone level was high. The. g6 _5 t6 ~& I6 w
follow-up visit was arranged within a few weeks to
; `: W% z7 p. z- G/ ~+ e' ~obtain testicular and abdominal sonograms; how-
9 l+ ]' |, f$ G, K, C% O6 k1 dever, the family did not return for 4 months.: e5 m1 E! L" o1 d. E6 Q
Physical examination at this time revealed that the
) Q- n2 b- W! rchild had grown 2.5 cm in 4 months and had gained
9 ]$ n( @' o, G4 [8 k W8 X2 kg of weight. Physical examination remained
& G' @& f W5 q! r9 i% [5 lunchanged. Surprisingly, the pubic hair almost com-" t# ?; s& A2 T, q8 r7 X
pletely disappeared except for a few vellous hairs at
1 a" }; B* V# L7 s; }+ F( Fthe base of the phallus. Testicular volume was still 2) c, L1 ^: U* r; S
mL, and the size of the penis remained unchanged.
5 f8 _: [) F1 P0 G* g) Y% i. kThe mother also said that the boy was no longer hav-
# j' O3 @- c( z' l* p3 A: Q, Jing frequent erections.
+ Q: Z( M2 I% ~1 v( @$ I8 ?: FBoth parents were again questioned about use of1 v: \+ f3 R' n8 ^
any ointment/creams that they may have applied to
, D/ M" N9 x; X1 l! @; m. p5 O- ithe child’s skin. This time the father admitted the
: m! z9 n( w, y. ~# q* ]! ?Topical Testosterone Exposure / Bhowmick et al 541
8 G1 X/ P% d xuse of testosterone gel twice daily that he was apply-
" c1 L- f1 ^( d% M, y7 ~$ c2 {9 f) uing over his own shoulders, chest, and back area for/ b/ s% |0 N$ Y2 m- ?
a year. The father also revealed he was embarrassed+ N- [0 m% c) L0 M, _
to disclose that he was using a testosterone gel pre-0 q" h9 E& C4 ?
scribed by his family physician for decreased libido
3 R* n3 n* G$ M8 ^secondary to depression.
. I7 p1 _8 ~8 s1 g: C/ K+ aThe child slept in the same bed with parents./ q2 _# I/ o! K
The father would hug the baby and hold him on his3 u8 l. o7 M4 D% s
chest for a considerable period of time, causing sig-
4 N4 I {3 a2 Unificant bare skin contact between baby and father.
' E: b( Z: ~" v5 ]) oThe father also admitted that after the phone call,- j- ~6 v8 I, x1 p/ j) @6 V: j
when he learned the testosterone level in the baby3 x, U6 {+ k% Z; \) v
was high, he then read the product information: {( Y, J( l$ t* Z5 h* j3 a
packet and concluded that it was most likely the rea-
0 d" T, c# E9 g. k6 xson for the child’s virilization. At that time, they/ c( Y5 I! \6 ~. S3 `: H' i
decided to put the baby in a separate bed, and the/ ]$ p$ \/ Q# f/ V) [
father was not hugging him with bare skin and had' p1 e3 K' p+ j. E
been using protective clothing. A repeat testosterone
8 A) O/ v* M; m; q1 p( Z7 o9 V' Ytest was ordered, but the family did not go to the' P; K6 O: F D* z& M! j0 b
laboratory to obtain the test.
7 B) N9 l5 |9 ~; ]% k3 sDiscussion
! g i9 t1 {2 B" a* {- |- K: Z5 C7 q5 IPrecocious puberty in boys is defined as secondary A/ h" X! Q, m s# W) S2 [
sexual development before 9 years of age.1,4
0 {4 i! m- E# r8 ^3 q3 |$ c' ]Precocious puberty is termed as central (true) when
3 E+ v6 c! x; T% M% T: Y7 `it is caused by the premature activation of hypo-
/ D# c8 C1 R8 u# t/ G0 X M+ e1 Dthalamic pituitary gonadal axis. CPP is more com-- G$ o! b' ]: D& p
mon in girls than in boys.1,3 Most boys with CPP
( u# f- a! M, Y& ?7 w: Ymay have a central nervous system lesion that is2 S; ^0 m( M4 ?4 O+ Z
responsible for the early activation of the hypothal-1 o6 U. E/ K; P) L. e% c
amic pituitary gonadal axis.1-3 Thus, greater empha-
; \3 G% M" C& h5 G* O' I$ a3 d% vsis has been given to neuroradiologic imaging in: L, I; {. l+ r& x) k
boys with precocious puberty. In addition to viril-
" s( C: Z: l( {6 u) o' b0 s7 xization, the clinical hallmark of CPP is the symmet-( P, }3 w9 {1 E2 Y
rical testicular growth secondary to stimulation by7 N: H% n9 {3 X5 ~: e
gonadotropins.1,3
3 R) D+ F+ F5 h" EGonadotropin-independent peripheral preco-
4 o7 G% j3 [9 v4 b- m2 Tcious puberty in boys also results from inappropriate1 Y" B+ e- s6 a% W. G" a
androgenic stimulation from either endogenous or h* Z5 D$ \; H" ]) e. r, D
exogenous sources, nonpituitary gonadotropin stim-: D1 b$ T6 p4 T
ulation, and rare activating mutations.3 Virilizing
' E" v/ e8 }* U6 K+ J4 a! v5 W \7 Icongenital adrenal hyperplasia producing excessive
, {) \! s1 a$ m7 Aadrenal androgens is a common cause of precocious
2 O! G# a1 T! Y7 ppuberty in boys.3,4" U3 _+ D7 a, P% u0 |% R
The most common form of congenital adrenal/ a. g& z& j u
hyperplasia is the 21-hydroxylase enzyme deficiency.
* u, K7 [, z( {" z! }The 11-β hydroxylase deficiency may also result in3 ?* t0 a; e5 \# ~' ?% @
excessive adrenal androgen production, and rarely,* G& w+ P6 N5 y0 \5 f
an adrenal tumor may also cause adrenal androgen: I8 r; j7 H/ y
excess.1,35 s! v: T8 w) K
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
* P5 L2 N' D+ c& v' f) G" j0 J( b542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
$ E6 T* F1 @" {+ c6 t: b+ dA unique entity of male-limited gonadotropin-: n3 n% ~! S' [ K7 \9 y( u
independent precocious puberty, which is also known( |4 V6 K) C* W2 K
as testotoxicosis, may cause precocious puberty at a- R4 i/ K( B1 T- L% A6 d. ^) S
very young age. The physical findings in these boys" V, d& T/ `; u0 A% _' M
with this disorder are full pubertal development,' G6 O- W( `1 m+ |: `5 w$ e
including bilateral testicular growth, similar to boys
0 L3 ?! |+ c0 a0 S+ Y/ Y1 \: Dwith CPP. The gonadotropin levels in this disorder
; u( \0 S8 |4 i& `1 pare suppressed to prepubertal levels and do not show+ A, U4 F2 z9 T0 j5 ~, X9 @
pubertal response of gonadotropin after gonadotropin-5 t% v) F3 T- d4 i; a+ T
releasing hormone stimulation. This is a sex-linked
1 V) I& O" E% T/ W. f- i* ]: |autosomal dominant disorder that affects only
4 W C0 u9 K8 pmales; therefore, other male members of the family- p8 r- U0 g' s8 `" b1 L
may have similar precocious puberty.3
; Z1 e, F- q' V/ mIn our patient, physical examination was incon-7 W q# c7 h, {% ~$ e0 g9 e5 I5 S3 B
sistent with true precocious puberty since his testi-
3 R* Z B7 C7 j6 v" |5 K6 J4 Pcles were prepubertal in size. However, testotoxicosis0 C5 N( ^% T* d* F
was in the differential diagnosis because his father
" Y: p7 O* Q+ Astarted puberty somewhat early, and occasionally,& T( C9 M" @2 N+ Q2 Z8 M
testicular enlargement is not that evident in the
5 N/ }* z' B8 K2 v( q7 {) t/ ^beginning of this process.1 In the absence of a neg-# e* ], W2 K4 ]6 r8 i* m$ H
ative initial history of androgen exposure, our- z0 [/ j8 `7 c( W/ v
biggest concern was virilizing adrenal hyperplasia,
6 C- G7 x0 o% r. Ceither 21-hydroxylase deficiency or 11-β hydroxylase
" C% v9 ^& g: P; L9 o# Rdeficiency. Those diagnoses were excluded by find-" `# v0 f- J# s# @
ing the normal level of adrenal steroids.
, {2 \ ?; N5 W( n# Z- T) }The diagnosis of exogenous androgens was strongly m$ m% R* _2 y0 E
suspected in a follow-up visit after 4 months because
4 K) w+ {6 [8 mthe physical examination revealed the complete disap-* A' W% l, s+ A1 g; D0 C
pearance of pubic hair, normal growth velocity, and6 n) t) ~$ v& \7 W1 Q
decreased erections. The father admitted using a testos-' P+ U9 r4 T( {5 a7 {
terone gel, which he concealed at first visit. He was, X. J/ I8 Z* @/ R4 a3 V4 [
using it rather frequently, twice a day. The Physicians’
" `6 O" F. L; U& o7 ZDesk Reference, or package insert of this product, gel or
: n9 }" A! E" O, O0 `. O2 d+ n+ qcream, cautions about dermal testosterone transfer to; m& c# ?; l! A
unprotected females through direct skin exposure.
8 e* W) d+ z) |" ~Serum testosterone level was found to be 2 times the
, z7 A- S) S. u5 k( ^4 Gbaseline value in those females who were exposed to4 M9 m% m7 u9 N9 D. {* T
even 15 minutes of direct skin contact with their male
; l8 A0 ^# o3 R4 R& }2 V: \1 ^partners.6 However, when a shirt covered the applica-
6 w: d- k& `9 t! [, a& ktion site, this testosterone transfer was prevented.% X( x+ @* ?* ^- M5 O$ w
Our patient’s testosterone level was 60 ng/mL,. g. f3 X- O/ g: I3 G
which was clearly high. Some studies suggest that) {9 u! w. X: C: b) _' e
dermal conversion of testosterone to dihydrotestos-$ t2 s) d, q" T
terone, which is a more potent metabolite, is more
6 [; F! b/ y# {7 p0 [, Lactive in young children exposed to testosterone
; T3 S2 o1 B' t! E# nexogenously7; however, we did not measure a dihy-! V9 z& F1 k* i i
drotestosterone level in our patient. In addition to3 V+ F+ r: e2 e6 J( x5 a0 W9 N
virilization, exposure to exogenous testosterone in
7 j4 m3 I, Y9 A, vchildren results in an increase in growth velocity and- ?6 N, n, z1 x1 f, H# l- O
advanced bone age, as seen in our patient.
5 ~! k x( ^+ }* g, r% j0 x) @The long-term effect of androgen exposure during, a( z* s9 R, X% G
early childhood on pubertal development and final; ]* p( H: } d, }5 J
adult height are not fully known and always remain5 y5 X& d* `; ~/ h+ n
a concern. Children treated with short-term testos-
4 o+ [9 O5 i' N6 M1 i0 m8 D6 U6 eterone injection or topical androgen may exhibit some8 _: {3 y3 i: m# u! i
acceleration of the skeletal maturation; however, after
9 V/ g( ]# C# k9 D. @6 ?- `4 M Ecessation of treatment, the rate of bone maturation0 d, f S0 I ~3 r
decelerates and gradually returns to normal.8,9
6 x. G$ H* j uThere are conflicting reports and controversy# g( v; [6 b. W2 `
over the effect of early androgen exposure on adult0 C7 Z; |+ a! g% j* ]
penile length.10,11 Some reports suggest subnormal
3 e5 f7 x4 W) a- ladult penile length, apparently because of downreg-( ~4 _! i5 ?) z3 S6 ~) R0 k
ulation of androgen receptor number.10,12 However,7 k, }+ [4 n6 q7 W8 \
Sutherland et al13 did not find a correlation between: m4 e. K, n! J' H
childhood testosterone exposure and reduced adult9 t( l q& [5 r0 E* j& m
penile length in clinical studies.$ H4 H. t" y0 b: e1 A- x t3 O* u
Nonetheless, we do not believe our patient is
- w5 d+ e, @- S) igoing to experience any of the untoward effects from
% l" h+ p' f: g5 }7 ]. P2 n8 htestosterone exposure as mentioned earlier because0 W* V! b4 Q, E! Y. l
the exposure was not for a prolonged period of time.
# g) d- ~3 m x' t H1 B; ^( a% C# MAlthough the bone age was advanced at the time of
* ^3 J7 h( W8 f! k: ?+ x" @diagnosis, the child had a normal growth velocity at
: q( o" l9 J0 `3 J Gthe follow-up visit. It is hoped that his final adult W2 v' B; s' `0 O; U
height will not be affected.
- P; }9 ~$ n/ X, NAlthough rarely reported, the widespread avail-& ^) q7 m6 h j$ O' _. B
ability of androgen products in our society may9 I6 t, F. E# K2 Y7 \( S! E b4 S
indeed cause more virilization in male or female
: Y' p+ X1 H! L4 ]children than one would realize. Exposure to andro-5 Q/ L3 @3 S# j* E- [ ^2 d: T
gen products must be considered and specific ques-, B8 E* \! }. m7 x( T. [
tioning about the use of a testosterone product or* ?0 U6 P$ R7 P& d( p
gel should be asked of the family members during. V; K; f ]- V8 {; U; S9 o2 _
the evaluation of any children who present with vir-
7 Z# J+ C9 ~# D6 f, w' ailization or peripheral precocious puberty. The diag-# i H+ T; U; k* @8 y8 U: p
nosis can be established by just a few tests and by+ Y, \9 f# x3 k/ t* h3 r+ ]' x
appropriate history. The inability to obtain such a( I- \" [8 N: s( m' s
history, or failure to ask the specific questions, may
& A5 \6 u* R2 Sresult in extensive, unnecessary, and expensive( t) b: W; |8 z# b& H. q
investigation. The primary care physician should be
: T2 N M2 d- V/ X' X6 Y. Vaware of this fact, because most of these children+ a/ ~/ Y; {, L5 ?8 e# k/ `
may initially present in their practice. The Physicians’( p/ C( G5 C0 q4 @- V/ D9 K3 X
Desk Reference and package insert should also put a
$ a4 ^! z$ M l9 F% Q& dwarning about the virilizing effect on a male or
2 Y, i( H2 L0 ^& J% [5 ~female child who might come in contact with some-8 k* C* B' O6 E, l3 h% s+ u
one using any of these products.
+ B+ ]( ~4 s5 }) W+ h3 oReferences
7 A$ n+ E4 {: c' r1. Styne DM. The testes: disorder of sexual differentiation. E$ a( ~" j0 b$ D* \1 C; `4 _
and puberty in the male. In: Sperling MA, ed. Pediatric
7 m* x: F( B; tEndocrinology. 2nd ed. Philadelphia, PA: WB Saunders;4 J6 O8 t2 T. w0 n" n+ j* w
2002: 565-628.. q, }, Q4 y6 ~$ `/ Y
2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious
, X$ s, g: E0 X+ n2 spuberty in children with tumours of the suprasellar pineal3 m4 h, o- W7 G W1 A0 I* d
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from5 p5 W4 l0 Q/ D; ?1 X0 K
Topical Testosterone Exposure / Bhowmick et al 5436 u9 T4 h. w- u c# r
areas: organic central precocious puberty. Acta Paediatr.' z3 c% `% a3 x$ {6 \
2001;90:751-756.
- X' k& ]2 Y' C; T( e3. Lee PA. Puberty and its disorders. In: Lifshitz F, ed.
% n! S# `- |( i) Y, @9 t2 KPediatric Endocrinology. 4th ed. New York, NY: Marcel4 Y7 \( n; V$ C" D. V
Dekker Inc; 2003:211-238.
; F; |( h1 `& O2 r' b% @8 Q0 I4. Yu YM, Punyasavatsu N, Elder D, D’Ercole AJ. Sexual
" M6 L- c E- B7 @0 ]1 rdevelopment in a two-year-old boy induced by topical! z( N" l6 [3 X7 d
exposure to testosterone. Pediatrics. 1999;104:e23.
: Y/ b" w1 ~2 l l/ j5. Greulich WW, Pyle SI, eds. Radiographic Atlas of8 w( k) Y5 o0 }2 s3 e( e, o$ o# S `
Skeletal Development of the Hand and Wrist. 2nd ed.
- T1 p$ P" Y6 w9 y4 P% }2 b0 uStanford, CA: Stanford University Press; 1959.# a4 N J0 C8 f& G5 k ?4 I9 v i
6. Physicians’ Desk Reference. Androgel 1% testosterone,
, y5 `% Z7 l- J6 y, ?Unimed Pharmaceutical Inc. Montvale, NJ: Medical5 J9 V; x3 [5 s0 i, s9 C# v* l
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