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is a significant concern for physicians. Central
( L) _4 |9 R. k% bprecocious puberty (CPP), which is mediated D: g/ `$ A: Y; v
through the hypothalamic pituitary gonadal axis, has
m; D% f9 t1 l, x9 T' ?a higher incidence of organic central nervous system
( x3 h+ O; \! Alesions in boys.1,2 Virilization in boys, as manifested
$ N+ m1 g$ i3 {6 ^by enlargement of the penis, development of pubic
$ a m! D2 E* Z* y. ]: Mhair, and facial acne without enlargement of testi-3 _' }# J# W0 I( n7 F) S7 l
cles, suggests peripheral or pseudopuberty.1-3 We7 W9 }( E" }. X1 h+ m% }% e
report a 16-month-old boy who presented with the
0 n. a! j" h6 i. p. U& uenlargement of the phallus and pubic hair develop-: B% e% l4 r5 p3 O9 D
ment without testicular enlargement, which was due2 Q# C( W+ p6 y7 m! b' J
to the unintentional exposure to androgen gel used by) s) N- l4 \, N5 O2 w# g% V: o4 r
the father. The family initially concealed this infor-+ [5 @. d) X* p$ F& J; [
mation, resulting in an extensive work-up for this
! C) D/ l: B$ X) C5 Y* f# x* fchild. Given the widespread and easy availability of+ r7 N" S1 f4 O2 z2 ^1 r9 ]
testosterone gel and cream, we believe this is proba-! _9 J$ o2 U0 f' M
bly more common than the rare case report in the0 U& n$ B9 Y5 S
literature.47 E. a, F. |+ Y
Patient Report
" y, w9 W7 R5 R' mA 16-month-old white child was referred to the
$ t a/ X# c1 I0 o$ s8 T4 [endocrine clinic by his pediatrician with the concern+ J" ?/ R# N5 D' z, W
of early sexual development. His mother noticed
- j7 w! t- Y1 y$ ~* I7 ?light colored pubic hair development when he was
- e3 o% }* @) r3 p1 h" SFrom the 1Division of Pediatric Endocrinology, 2University of
5 P( O3 a$ J& A7 PSouth Alabama Medical Center, Mobile, Alabama.- U( |0 c% U- f( A, i
Address correspondence to: Samar K. Bhowmick, MD, FACE,+ I5 G3 u$ P- J
Professor of Pediatrics, University of South Alabama, College of
) g% X5 ?( ]+ E( C% p2 oMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;( H+ _8 l) R& S7 R% K1 ~8 @% f
e-mail: [email protected].
' Z. c4 H6 V6 k2 A9 @about 6 to 7 months old, which progressively became8 k8 U5 Q, F% Q( G) l
darker. She was also concerned about the enlarge-
8 I; G' X+ `; K. D* P" D+ F# g4 w1 qment of his penis and frequent erections. The child# V6 W! S% h/ E+ G5 S$ N
was the product of a full-term normal delivery, with
# e8 Z" K! {6 o( \' A7 Ra birth weight of 7 lb 14 oz, and birth length of3 g$ w. L, g2 L5 d S0 ]
20 inches. He was breast-fed throughout the first year
) k4 \: R* J$ I' A8 oof life and was still receiving breast milk along with
' ~3 n* H* h$ ]# o" D8 l' Wsolid food. He had no hospitalizations or surgery,% i: Y. F4 o$ A7 N+ ?% c
and his psychosocial and psychomotor development% g: Q0 p0 n) n' Q4 |& c) f, y/ U
was age appropriate.2 R( L/ h m6 {. o/ Q) E
The family history was remarkable for the father,
. k: }/ a7 o( q' i6 ^who was diagnosed with hypothyroidism at age 16,
2 w3 \7 W! K# ]which was treated with thyroxine. The father’s
+ S4 [- o; [; p4 l9 nheight was 6 feet, and he went through a somewhat
# w$ E% `0 s9 W( q# X9 o" @early puberty and had stopped growing by age 14." Q. K- h* ~/ o
The father denied taking any other medication. The% M e) a! D+ M* h4 v8 g" ]
child’s mother was in good health. Her menarche
' b( p: M. A1 l6 dwas at 11 years of age, and her height was at 5 feet
, U$ R) w6 P( ]5 }5 inches. There was no other family history of pre-
, Y' ?8 y/ z. j8 l4 M8 i8 \cocious sexual development in the first-degree rela-
: @" k4 T, p- r) Otives. There were no siblings.
2 {5 h- x$ A/ v, o; S p( dPhysical Examination' S8 ], H7 ]' K4 q' H- K3 X
The physical examination revealed a very active,0 B9 L7 g* K9 ^9 b% _/ ~
playful, and healthy boy. The vital signs documented( }. _/ X D5 e- M2 Q' E
a blood pressure of 85/50 mm Hg, his length was. b' q1 L& q0 k& F( f
90 cm (>97th percentile), and his weight was 14.4 kg8 L7 C0 W+ E1 N# v t8 g
(also >97th percentile). The observed yearly growth# O$ Y; ]" d" X
velocity was 30 cm (12 inches). The examination of
4 H6 c* d9 {% Wthe neck revealed no thyroid enlargement.$ ~; O+ \# U$ M
The genitourinary examination was remarkable for# Y2 y9 ?* E$ V" q) W% S
enlargement of the penis, with a stretched length of$ ]% |0 N, T1 h) H, [4 k! [ C
8 cm and a width of 2 cm. The glans penis was very well
: U% g6 ~; \# [% Tdeveloped. The pubic hair was Tanner II, mostly around- ?! a2 m2 m, }
540" k# l5 }. O. o* {# Q8 u7 N G
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
5 v: \2 F0 N: l1 m# f/ ythe base of the phallus and was dark and curled. The
9 p# z) r# l$ htesticular volume was prepubertal at 2 mL each.. [! G" v! }6 I! E0 v2 F! J
The skin was moist and smooth and somewhat
# |% l' m% X7 `) h& Goily. No axillary hair was noted. There were no
( n L+ q4 ?+ v0 ^abnormal skin pigmentations or café-au-lait spots.3 Z6 Y" m& k: K! R3 W& V- }
Neurologic evaluation showed deep tendon reflex 2+
' L: W3 ]; I4 s1 u8 M1 Ibilateral and symmetrical. There was no suggestion
, b3 D' ^; q6 y# g$ K; xof papilledema.2 n7 ?" ^) \" T
Laboratory Evaluation
0 _: w G8 ]# R4 ^The bone age was consistent with 28 months by
, s- h1 U8 n. W# |, M) x1 ~using the standard of Greulich and Pyle at a chrono-
, k7 U3 @) F0 ^- |logic age of 16 months (advanced).5 Chromosomal
r) |2 [; B2 l: j9 ?4 m4 Mkaryotype was 46XY. The thyroid function test
' P! P% \* }! V* v9 W6 j. E/ ^showed a free T4 of 1.69 ng/dL, and thyroid stimu-* Z# B& W' F! Y7 y4 J( P- s
lating hormone level was 1.3 µIU/mL (both normal).
! R% [8 l# g$ V+ @3 {The concentrations of serum electrolytes, blood2 S! ]6 K; Z* ]2 b) S# C( B
urea nitrogen, creatinine, and calcium all were- {) P9 R4 q- m. g) {
within normal range for his age. The concentration
8 W# t. z G' a% j2 ]$ mof serum 17-hydroxyprogesterone was 16 ng/dL
8 f. @7 [! M- a0 h3 S(normal, 3 to 90 ng/dL), androstenedione was 20
+ C0 O1 T; O, i' [( z* \: h( Lng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-+ V- X, X! `* O) v x
terone was 38 ng/dL (normal, 50 to 760 ng/dL),
; G" ~& m( [3 ^8 ^: W gdesoxycorticosterone was 4.3 ng/dL (normal, 7 to
: D" Z- v/ V7 F* ^+ G J, b0 q4 i49ng/dL), 11-desoxycortisol (specific compound S)$ I. _1 Q. H; e7 r/ n
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-( `; H6 V. L' L% H, t5 m
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total8 R) q4 v; s# q( B* M
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),7 d3 W# F" Z( V3 U1 e: e
and β-human chorionic gonadotropin was less than% q0 D: z& G" ?
5 mIU/mL (normal <5 mIU/mL). Serum follicular$ m$ s( y/ H8 U2 B( C& A
stimulating hormone and leuteinizing hormone$ K/ Y$ d# N3 p4 w* M* [
concentrations were less than 0.05 mIU/mL
; ^0 ]$ p! @" C. J4 Q# m+ e$ }(prepubertal).
+ s7 C1 |& ~6 Y3 L* ^The parents were notified about the laboratory
1 {) i1 B3 _. B+ c5 U- X+ {results and were informed that all of the tests were1 `0 S% @7 P6 X& Z: K
normal except the testosterone level was high. The" _, T4 E9 ^0 k# F6 Z o
follow-up visit was arranged within a few weeks to% G. l/ X7 N2 O. O# V0 X/ ~
obtain testicular and abdominal sonograms; how-
/ m, {) f/ q7 y. Iever, the family did not return for 4 months., A* K! p1 F3 q% \5 p) l) U6 h
Physical examination at this time revealed that the4 H0 I1 w* d0 O) a1 h( ~
child had grown 2.5 cm in 4 months and had gained% M5 h7 ~, w2 t8 D2 q' @
2 kg of weight. Physical examination remained
; Y0 M, ]0 S: ]% R( junchanged. Surprisingly, the pubic hair almost com-# l+ V6 p/ w4 H9 m
pletely disappeared except for a few vellous hairs at
4 K# O8 { N9 C8 ?the base of the phallus. Testicular volume was still 26 U3 w1 R9 t8 {/ N6 g0 Q& _$ @) l
mL, and the size of the penis remained unchanged.4 t2 U5 M5 F; f/ q
The mother also said that the boy was no longer hav-
7 P: m; v) v# s- I. Z: Ling frequent erections.1 H' ^, K8 j, c' v& [6 H
Both parents were again questioned about use of) F/ v- |4 l0 \; R" z$ h
any ointment/creams that they may have applied to
- ^. a, x8 }, I, j( F3 @the child’s skin. This time the father admitted the
7 @9 e7 t" g2 z2 a( W+ \% ]- {Topical Testosterone Exposure / Bhowmick et al 541
" Y5 f3 J) v' Euse of testosterone gel twice daily that he was apply-6 I# }- C0 v' I8 A7 @! E3 e
ing over his own shoulders, chest, and back area for1 T8 ^! x0 b* d0 X9 |# s2 i+ z: }
a year. The father also revealed he was embarrassed3 \8 n/ E% z# Z- R* t
to disclose that he was using a testosterone gel pre-
' W* Z: B- T' [7 V }4 m; Jscribed by his family physician for decreased libido: R+ e3 D1 v) W) Y# B2 v
secondary to depression.( S- ^6 ~9 f0 V& o7 L1 S
The child slept in the same bed with parents.
. i* e. A; T5 y0 gThe father would hug the baby and hold him on his1 |; K9 c% x# Q* N% h; g; R
chest for a considerable period of time, causing sig-4 T8 K2 t4 p6 p w9 u
nificant bare skin contact between baby and father.# W, S0 n' ~$ {7 z; j
The father also admitted that after the phone call,
% v# Q3 d, r, J3 Jwhen he learned the testosterone level in the baby
4 ~3 N: ?# g/ V: t9 |was high, he then read the product information
4 ~8 h4 Q; [3 `3 o" J; P1 O( W5 P! Npacket and concluded that it was most likely the rea-3 h0 i4 C) }4 n5 ?7 k- g
son for the child’s virilization. At that time, they& ~* n2 r3 d3 G) V, F
decided to put the baby in a separate bed, and the, q4 P5 U7 Q. o' D
father was not hugging him with bare skin and had
0 M [3 a7 h' r! x% A& D* ?been using protective clothing. A repeat testosterone8 \. H5 e7 @. M" c1 S. m6 N
test was ordered, but the family did not go to the9 {" f& R ?4 ]0 H4 A
laboratory to obtain the test.
8 _" ]) p- S* s* S* p7 |; N6 ]Discussion4 s# P- [4 |7 |% J
Precocious puberty in boys is defined as secondary7 C, J! E1 k" N2 I' ?) j9 p
sexual development before 9 years of age.1,4
" o- \3 G0 l3 w: n/ x7 @6 dPrecocious puberty is termed as central (true) when
$ U+ J9 _# }* i" N, A5 J) o9 ]7 Vit is caused by the premature activation of hypo-0 `4 k1 j, I0 E9 h1 \
thalamic pituitary gonadal axis. CPP is more com-
; Q' S/ W7 f1 Z& {. a2 ?! emon in girls than in boys.1,3 Most boys with CPP
( N2 Y' T: i: _' `may have a central nervous system lesion that is
- g# p9 ~6 K {1 `2 B+ Wresponsible for the early activation of the hypothal-
* ]9 X& M( R' @; H6 eamic pituitary gonadal axis.1-3 Thus, greater empha-2 C0 m" p+ p ~9 R$ x
sis has been given to neuroradiologic imaging in
6 \" v; Y! I' ?; Uboys with precocious puberty. In addition to viril-
K$ x1 s! Z1 K1 vization, the clinical hallmark of CPP is the symmet-
% S. l; b ?# _rical testicular growth secondary to stimulation by
! k6 N% U1 l8 F4 W$ G: Tgonadotropins.1,3$ \' y! e; z7 M5 l
Gonadotropin-independent peripheral preco-
8 {) d: j. k2 p) Ccious puberty in boys also results from inappropriate1 {9 o& s/ |7 {: z+ C, e# I# U. r
androgenic stimulation from either endogenous or: B( R3 d8 M- G: u
exogenous sources, nonpituitary gonadotropin stim-
5 a ~& G$ Y3 s( T) T& ^ulation, and rare activating mutations.3 Virilizing
; T" I4 R& H5 h }: pcongenital adrenal hyperplasia producing excessive
& ? E9 m. W5 Z, @adrenal androgens is a common cause of precocious
3 t$ Z& U' K6 H- ^puberty in boys.3,4
0 G0 U6 a( r$ m: |7 LThe most common form of congenital adrenal
" e% I% U" }: Zhyperplasia is the 21-hydroxylase enzyme deficiency.! Y( q0 e8 A7 ~; e! s# z2 y
The 11-β hydroxylase deficiency may also result in
5 P/ j* B0 Y0 Q, `( J4 rexcessive adrenal androgen production, and rarely,+ ~0 Z/ L8 l& U7 q
an adrenal tumor may also cause adrenal androgen
, E! L1 z$ X3 k$ G; Eexcess.1,3
' \- ~! Z0 e) i$ ]6 Aat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
5 f( e0 a( s! E9 y A542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
# \( N+ E5 p& Y' _* Y- oA unique entity of male-limited gonadotropin-
# ^& k U6 `' aindependent precocious puberty, which is also known I( W& s" B r
as testotoxicosis, may cause precocious puberty at a
) n- N7 U( A) i4 f% K! Mvery young age. The physical findings in these boys
- i% w: H. q/ I- V7 C3 M7 m3 Owith this disorder are full pubertal development,
2 F. a4 a/ {3 }. y- a/ J+ wincluding bilateral testicular growth, similar to boys
5 L9 I/ P0 F$ J) p$ X3 t/ M/ B6 ewith CPP. The gonadotropin levels in this disorder; d2 i/ y1 u7 W
are suppressed to prepubertal levels and do not show
! N) f4 @. p& [pubertal response of gonadotropin after gonadotropin-
7 y: h, P3 P& a) V h: w. Zreleasing hormone stimulation. This is a sex-linked
9 s6 t( q$ r' M" F- i# Jautosomal dominant disorder that affects only
3 ?5 i* Q. d) g# l+ N2 bmales; therefore, other male members of the family! I* M! d# W+ @# [4 [0 c2 w
may have similar precocious puberty.3' o. F6 j! v2 @0 _" `* a- h {
In our patient, physical examination was incon-# E( ?; i- r' E% R2 l. I
sistent with true precocious puberty since his testi-
2 B+ U+ {2 S* ?, o6 u, tcles were prepubertal in size. However, testotoxicosis
9 ?+ F' p# t/ ]: `0 r5 Uwas in the differential diagnosis because his father
4 S2 _& C' q& F, N8 l/ V1 Estarted puberty somewhat early, and occasionally,! ]2 R5 x" Z6 k3 J+ s/ c" ]
testicular enlargement is not that evident in the" x! I( I0 a# `. w2 f
beginning of this process.1 In the absence of a neg-
3 Z& P8 z' R$ s1 `4 S6 Aative initial history of androgen exposure, our
% X' q1 D! w! k7 {' E! L9 ]% abiggest concern was virilizing adrenal hyperplasia,
4 Z: V3 R0 {6 Ceither 21-hydroxylase deficiency or 11-β hydroxylase9 A* M J3 S) i( [5 ^4 W/ C
deficiency. Those diagnoses were excluded by find-
3 Y) @6 K) \9 ving the normal level of adrenal steroids.5 o" }. _ s' \# O8 w
The diagnosis of exogenous androgens was strongly
/ ^8 X$ q0 g& ?% asuspected in a follow-up visit after 4 months because
9 Z/ q! M2 r% g, H: d2 U/ v0 x8 H4 t/ [the physical examination revealed the complete disap-# e- o# g& Y3 [: w5 `# C
pearance of pubic hair, normal growth velocity, and( k7 s5 @- V) {: o8 z. M
decreased erections. The father admitted using a testos-
0 \1 S" K* r9 u2 X. Z4 pterone gel, which he concealed at first visit. He was
7 \( a& O( l5 a6 u6 xusing it rather frequently, twice a day. The Physicians’
, J& i8 e$ v: @) M+ k/ t$ Q/ e. h$ MDesk Reference, or package insert of this product, gel or. _ s: u7 |6 G4 D) A) m- m
cream, cautions about dermal testosterone transfer to+ \/ n) x$ l8 N3 W8 w; {& N' A
unprotected females through direct skin exposure.
. `$ B( t/ T1 d2 w, Y0 hSerum testosterone level was found to be 2 times the5 }7 s# N$ ?: y* }' D, Q% O
baseline value in those females who were exposed to
/ T# a1 q M- X. {+ geven 15 minutes of direct skin contact with their male) Y: m/ s2 N2 k- f( j: X
partners.6 However, when a shirt covered the applica-
2 Z& _& W# `1 O& |3 _tion site, this testosterone transfer was prevented.
A- F1 A+ S* s: b% ^$ WOur patient’s testosterone level was 60 ng/mL,
/ v# k" O/ I, H2 x0 x' twhich was clearly high. Some studies suggest that- i8 q Z1 i3 D3 L8 |
dermal conversion of testosterone to dihydrotestos-1 U+ G$ N" X( w. Q' _
terone, which is a more potent metabolite, is more) H4 X: G) x# }, I+ Q- i
active in young children exposed to testosterone% h' B! Y; C; O1 I/ u1 K7 ^' u
exogenously7; however, we did not measure a dihy-8 F# d* U4 }6 h( ]7 {
drotestosterone level in our patient. In addition to. E: j$ K7 l, l" S! M9 n, O& n* J
virilization, exposure to exogenous testosterone in
8 P* w1 h# \ q1 D' mchildren results in an increase in growth velocity and, B2 m. ?9 [1 S! V. Z' [% ~
advanced bone age, as seen in our patient.2 G$ }) ?3 N( p
The long-term effect of androgen exposure during
* j# }) w9 A" xearly childhood on pubertal development and final6 V( c) f& Q _
adult height are not fully known and always remain5 ]$ M6 f( Y$ A1 V
a concern. Children treated with short-term testos-, S& U& o/ w5 ]3 h8 i
terone injection or topical androgen may exhibit some! N% B/ U' n. _0 X% m
acceleration of the skeletal maturation; however, after
6 U: L- \" i7 x" Wcessation of treatment, the rate of bone maturation9 y# G0 B' x: d' J
decelerates and gradually returns to normal.8,9
! o+ s( T$ V& Z/ ^' QThere are conflicting reports and controversy s) t: R6 q) C
over the effect of early androgen exposure on adult6 l& _! N; i6 W: X% e) a
penile length.10,11 Some reports suggest subnormal" m. K3 s E3 w* `& n3 ]
adult penile length, apparently because of downreg-5 ~' ^' y' Q1 N4 R, A: B9 }
ulation of androgen receptor number.10,12 However,
& ?! Q% X/ n% X" E% T8 zSutherland et al13 did not find a correlation between
- I. F' d3 i+ `: E+ bchildhood testosterone exposure and reduced adult
2 `# m- g' Y" L6 I* c/ X4 h, t- F' dpenile length in clinical studies.
' J9 J1 L( x" z- x8 x3 Y3 hNonetheless, we do not believe our patient is9 Q6 l' H: ]$ Y3 U
going to experience any of the untoward effects from9 v2 p! Q$ K& [+ `
testosterone exposure as mentioned earlier because
" @0 Q; }3 h2 p' M: }) xthe exposure was not for a prolonged period of time.5 |% ^( m' H% ? p! ~5 e S3 Z. f; V
Although the bone age was advanced at the time of9 O4 Y6 a! k+ A6 d
diagnosis, the child had a normal growth velocity at; k" x6 u6 {5 |# r+ V
the follow-up visit. It is hoped that his final adult; k* \& F2 x1 a# Z: F& y- f
height will not be affected./ M! a9 L' [1 I0 @
Although rarely reported, the widespread avail-
! u. e+ W# v* G1 }9 ?! b- a eability of androgen products in our society may" ]7 }9 _2 r+ h
indeed cause more virilization in male or female
' _8 F# E* a# R+ N% [0 K2 Schildren than one would realize. Exposure to andro-, u2 _; z" }4 w2 X8 n9 w5 n
gen products must be considered and specific ques-, ?* Z! j4 `/ r5 ]- ]. f4 l9 @& s
tioning about the use of a testosterone product or
9 L9 w* B, P+ _9 t) C/ g; k4 kgel should be asked of the family members during
* l" p; r5 y# ~5 }6 b& Sthe evaluation of any children who present with vir-
2 C0 W: \# u, W! H; n7 |ilization or peripheral precocious puberty. The diag-
, W1 ]+ b; M8 |# F8 \& t% Snosis can be established by just a few tests and by( U- z0 @) s* Y! ]
appropriate history. The inability to obtain such a; F; h) `" G, I. |3 M2 c8 c
history, or failure to ask the specific questions, may* r6 h8 M" V0 b n/ e
result in extensive, unnecessary, and expensive
+ j! b2 b/ `3 q# O0 oinvestigation. The primary care physician should be7 Q; B$ s$ u! F1 s: M+ M6 k' I
aware of this fact, because most of these children8 ~3 r8 a( z5 S) w6 a
may initially present in their practice. The Physicians’$ f4 q H" `5 R, Q3 A) x
Desk Reference and package insert should also put a4 @2 W9 {! |3 p) z0 q/ c
warning about the virilizing effect on a male or4 M" x9 @& w, w9 F0 v# C
female child who might come in contact with some-, g, C0 S, I$ r: p% B, q
one using any of these products.
7 | o7 a% s$ i6 V, [References* M9 k$ b* c( F# W- g
1. Styne DM. The testes: disorder of sexual differentiation2 a& q* I$ N# L
and puberty in the male. In: Sperling MA, ed. Pediatric1 a& O" a* T( {: C! w
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, k5 F* D; v3 z+ A; S! Y. p2002: 565-628.
% C1 H8 v- \% w7 Q y$ f2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious1 H0 [# v( _) u) P7 r6 C
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2 ~ v/ T% Y3 q, C& W: x- Zareas: organic central precocious puberty. Acta Paediatr.
& Y+ k5 w2 t& i0 O# b( g2001;90:751-756.
& f# l0 `, e$ A6 Q3 }& y3. Lee PA. Puberty and its disorders. In: Lifshitz F, ed., o# _0 _$ j- K+ o' g
Pediatric Endocrinology. 4th ed. New York, NY: Marcel
: a. l& n9 J7 T* W W( _, p1 CDekker Inc; 2003:211-238.
0 w; J# }/ z5 {7 }0 v1 g) j4. Yu YM, Punyasavatsu N, Elder D, D’Ercole AJ. Sexual6 \/ J# Z3 S2 J- g: `
development in a two-year-old boy induced by topical6 w) |0 b2 E( |# ~6 H2 ?) X
exposure to testosterone. Pediatrics. 1999;104:e23.
! `' h* q( W- a* O5 q5. Greulich WW, Pyle SI, eds. Radiographic Atlas of1 h& @: i/ e, R( K; q2 L% |% d9 {
Skeletal Development of the Hand and Wrist. 2nd ed.
0 [# B9 |5 ?( L. i0 Q" b# ^, ZStanford, CA: Stanford University Press; 1959.
, {0 Q! f: {' s( V6. Physicians’ Desk Reference. Androgel 1% testosterone,
( S4 x: L9 P f$ K7 t( kUnimed Pharmaceutical Inc. Montvale, NJ: Medical
. x! Z ], r4 Z4 xEconomics Company, Inc; 2004:3239-3241.+ M. F+ l& M/ [* M& r1 t0 k* [. `9 r
7. Klugo RC, Cerny JC. Response of micropenis to topical* K% @7 h# \# U
testosterone and gonadotropin. J Urol. 1978;119:' N- U- l* Y5 |( ~( |
667-668.9 x: y9 E* ^# S; a# Z
8. Guthrie RD, Smith DW, Graham CB. Testosterone
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