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is a significant concern for physicians. Central
: q9 f$ _5 P; ?) w, O8 Xprecocious puberty (CPP), which is mediated
% ~, c, o+ D: ?$ ` W! Qthrough the hypothalamic pituitary gonadal axis, has$ c" \' X) T1 J, _
a higher incidence of organic central nervous system
5 Q( ?) \& _: @( m6 g( wlesions in boys.1,2 Virilization in boys, as manifested: _5 X+ m- j( ^4 s* X
by enlargement of the penis, development of pubic* P2 C9 f6 R- w2 |- J
hair, and facial acne without enlargement of testi-
4 L* S9 I! m7 x3 C; [/ i0 Dcles, suggests peripheral or pseudopuberty.1-3 We
) {4 v* o4 Q4 N8 L) U# creport a 16-month-old boy who presented with the9 N- d) s( K! R V' D/ F
enlargement of the phallus and pubic hair develop-4 J, A4 w# \$ L2 L) q3 W9 k
ment without testicular enlargement, which was due+ N0 X7 s4 x% s3 O |
to the unintentional exposure to androgen gel used by
# A8 R- h) L- U1 x$ m5 n2 Xthe father. The family initially concealed this infor-
6 K* d2 t3 L0 Ymation, resulting in an extensive work-up for this7 Z6 R. Y5 d* ]$ v0 _& O8 h, V# P
child. Given the widespread and easy availability of0 M" j) r: [. v; r, F
testosterone gel and cream, we believe this is proba-
1 e9 {" D( E( m0 d0 E' \bly more common than the rare case report in the
4 ^5 m3 W$ y5 D6 M+ B) Z/ @7 Dliterature.4; X4 i, C6 e9 S- q
Patient Report
4 \2 T. n$ m, q: MA 16-month-old white child was referred to the
8 D1 y) x& p+ |( C+ G2 }' S6 Pendocrine clinic by his pediatrician with the concern
% | r" W: m& `8 c# ], @2 }$ dof early sexual development. His mother noticed: c& q3 b* k) K" d5 h& Q! N2 g
light colored pubic hair development when he was
* ]- `; _3 F Q/ m+ H; Z, mFrom the 1Division of Pediatric Endocrinology, 2University of! l! T/ L, |2 d3 ?
South Alabama Medical Center, Mobile, Alabama.
8 q0 G; e; X* J% @2 T% e( rAddress correspondence to: Samar K. Bhowmick, MD, FACE,. W+ m* j+ M7 ~ I( X* V, W
Professor of Pediatrics, University of South Alabama, College of
0 g, `) w5 j- I }Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;/ E6 @& t, N% t" m1 }. c
e-mail: [email protected].! l& T. b/ e: q9 H3 [
about 6 to 7 months old, which progressively became! M" a' B8 o6 S# s4 _# k4 B
darker. She was also concerned about the enlarge-
5 B6 V( Y2 i9 {- d$ G2 b3 x0 \, z* f8 _ment of his penis and frequent erections. The child, s; @0 p. Z, b4 r) Y
was the product of a full-term normal delivery, with( z! o( _; h C& B& e( Z
a birth weight of 7 lb 14 oz, and birth length of
% D5 Y8 Z% U$ s20 inches. He was breast-fed throughout the first year
' F- d9 ^ A* A4 T v0 Oof life and was still receiving breast milk along with
2 \3 O$ p6 R- I/ E6 T1 {solid food. He had no hospitalizations or surgery," {$ ]- L, \# |7 d; u G2 c+ ^
and his psychosocial and psychomotor development6 k* |$ u" u+ l. [, x' o$ D4 R
was age appropriate.
$ G2 m. V0 h' @' s; U$ z7 G; hThe family history was remarkable for the father,
4 @# Z+ f9 y" x c* rwho was diagnosed with hypothyroidism at age 16,. w& w/ P9 D& v+ ]1 ?
which was treated with thyroxine. The father’s
: ^7 G# G8 A6 z, dheight was 6 feet, and he went through a somewhat
7 `" U) A$ B% T7 rearly puberty and had stopped growing by age 14.4 m2 R4 a5 P- b9 U8 m! V; l
The father denied taking any other medication. The- ?# V2 C1 _+ y* s9 w
child’s mother was in good health. Her menarche
8 b, G+ Q) ?5 h: r: ewas at 11 years of age, and her height was at 5 feet; ?# d% m) b( z9 @
5 inches. There was no other family history of pre-
# s: Z2 q! _" scocious sexual development in the first-degree rela-
! Y% Z* i1 _2 {& D ntives. There were no siblings.4 J; f9 M9 }6 ~- \3 [5 T
Physical Examination
- W m5 o& q0 Y uThe physical examination revealed a very active,4 }" h! f2 z t5 y! u
playful, and healthy boy. The vital signs documented
5 Z4 p: W: B Ka blood pressure of 85/50 mm Hg, his length was7 Y6 j8 k8 I! J/ l
90 cm (>97th percentile), and his weight was 14.4 kg
& G3 f' H& j! d% Z' u(also >97th percentile). The observed yearly growth
+ R7 k. j+ ^# {4 l6 n1 Uvelocity was 30 cm (12 inches). The examination of
8 Y% i& |$ O9 zthe neck revealed no thyroid enlargement.
; b# a, @5 M% [9 i. nThe genitourinary examination was remarkable for
# }* z1 s" Y/ q! Henlargement of the penis, with a stretched length of
. G/ ] _2 G+ z/ S6 @8 d8 cm and a width of 2 cm. The glans penis was very well
6 l& f0 g4 @- ^( ideveloped. The pubic hair was Tanner II, mostly around: e4 z4 w3 H2 L N0 j
540* i' p, a9 E- P# R
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
* S, p8 ~% O) z% x; y; Bthe base of the phallus and was dark and curled. The
- k" T: c: N0 z1 x# Gtesticular volume was prepubertal at 2 mL each.
$ K! \" }9 |& c+ Z8 q/ D$ jThe skin was moist and smooth and somewhat" ?) c$ Y' C a0 ]7 _
oily. No axillary hair was noted. There were no
$ l' {( z0 H' P' }! |abnormal skin pigmentations or café-au-lait spots.+ N8 e. ~2 h3 E' e- n* {0 \- ^
Neurologic evaluation showed deep tendon reflex 2+7 u0 u. p8 C; p. a, T* c
bilateral and symmetrical. There was no suggestion
( w E4 d* ]& t( c0 Hof papilledema.; @( }; n" {1 f3 D" Y
Laboratory Evaluation) ~; A8 i, P) b) u/ U0 g2 O/ L- I
The bone age was consistent with 28 months by
! T+ v ?+ z4 f8 L9 F- j& Dusing the standard of Greulich and Pyle at a chrono-
9 n( i/ q* i; @, q; r# L0 b! slogic age of 16 months (advanced).5 Chromosomal
+ a1 t% F8 \2 P7 U( }3 R$ W* akaryotype was 46XY. The thyroid function test
2 I% r+ M2 p5 O% i, Zshowed a free T4 of 1.69 ng/dL, and thyroid stimu-
w# p, F7 d9 Z- ~" |: I' u/ rlating hormone level was 1.3 µIU/mL (both normal).7 `! X) U- H, ]5 S- W
The concentrations of serum electrolytes, blood# A" L8 H7 n, C
urea nitrogen, creatinine, and calcium all were1 `- X7 I! p2 R6 v
within normal range for his age. The concentration
: f7 L. [, T. a; p5 xof serum 17-hydroxyprogesterone was 16 ng/dL
' U' `- |1 o$ S(normal, 3 to 90 ng/dL), androstenedione was 20) i6 f1 X# k( I% k
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-! [" |" {4 i' \9 T, d- R
terone was 38 ng/dL (normal, 50 to 760 ng/dL),, {/ z7 J1 x0 Q* v* `0 c2 H
desoxycorticosterone was 4.3 ng/dL (normal, 7 to: K0 g7 f* K) o- \4 I- Z I; W1 K0 W
49ng/dL), 11-desoxycortisol (specific compound S); x9 }- F, K4 `1 y3 _8 A2 ?& H
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-. ?! h$ A+ u% F& G8 h: M) n
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
7 K2 ^7 Y, Y4 U6 Ztestosterone was 60 ng/dL (normal <3 to 10 ng/dL),
P) ]. s. ]# ]+ Mand β-human chorionic gonadotropin was less than
5 V/ D$ r# S! ^4 v5 mIU/mL (normal <5 mIU/mL). Serum follicular& D6 L8 g4 H4 x$ O" q, L3 ?
stimulating hormone and leuteinizing hormone
P5 S/ R S: B9 w& [- Pconcentrations were less than 0.05 mIU/mL- Z+ @1 F7 ? r
(prepubertal).1 _5 h+ A3 C. n; X E8 E9 f
The parents were notified about the laboratory
, x4 r9 j/ v3 V0 V2 @ `1 D0 L* Q! Fresults and were informed that all of the tests were
4 Z, V- I4 ^ onormal except the testosterone level was high. The
: u- R# w0 V8 r# Afollow-up visit was arranged within a few weeks to7 _ d) [0 `6 G' e9 }( o5 u7 u
obtain testicular and abdominal sonograms; how-8 X+ ^6 X: P+ h: L, v$ z- ]7 @; X
ever, the family did not return for 4 months.
V: j9 |4 S! x& ^Physical examination at this time revealed that the
, a" `7 y# ^# z6 e, ?0 M* _5 Pchild had grown 2.5 cm in 4 months and had gained7 C% i8 j0 Y- V4 A/ z
2 kg of weight. Physical examination remained8 L- q7 V' _1 B) z. d y
unchanged. Surprisingly, the pubic hair almost com-3 _5 q5 ^) v8 l! Q% |4 m
pletely disappeared except for a few vellous hairs at
( w; V6 z0 B& Uthe base of the phallus. Testicular volume was still 2
& m' L3 [3 Y0 S7 H+ F+ NmL, and the size of the penis remained unchanged.
! U2 h# [' [6 p' u/ G% y! mThe mother also said that the boy was no longer hav-( p% l0 G4 x' d
ing frequent erections.5 w$ d# B! d( a2 G8 m H( ]/ @
Both parents were again questioned about use of; H+ ^6 |* u4 @
any ointment/creams that they may have applied to
8 m1 w; f, }% N _the child’s skin. This time the father admitted the
+ C8 x: a% ?1 `$ w; Y; r* ^Topical Testosterone Exposure / Bhowmick et al 541
7 ?# m/ e5 F; C+ L2 H! `use of testosterone gel twice daily that he was apply-5 |& y3 d. |" K6 i8 d, {
ing over his own shoulders, chest, and back area for
) K7 f0 s! \7 |a year. The father also revealed he was embarrassed
) x A5 a$ c; B( ]to disclose that he was using a testosterone gel pre-
' J. `; R7 A7 {9 {0 F' j! @' Bscribed by his family physician for decreased libido) v' |+ E, d: y/ Y* X
secondary to depression.! R h" v* W7 K4 L0 U9 z* U4 K* M9 C0 V
The child slept in the same bed with parents.% p) g( T! _, Z' ]3 z1 i( m9 ]
The father would hug the baby and hold him on his5 x# O1 x4 s# Z D/ l& v
chest for a considerable period of time, causing sig-2 ]( q6 m$ w, ^9 \! D
nificant bare skin contact between baby and father.
% z" _/ v% r- g4 d) S% x( uThe father also admitted that after the phone call,
6 x3 J0 k0 ?5 Kwhen he learned the testosterone level in the baby
; m$ p/ k" C+ H+ `: Swas high, he then read the product information; k) h- B% l5 Q# ~+ j5 c
packet and concluded that it was most likely the rea-) m8 O0 b. |) t8 |; e' I
son for the child’s virilization. At that time, they
1 _, U; n/ |8 ?decided to put the baby in a separate bed, and the
: j5 l( l* z" ^' t% ^- cfather was not hugging him with bare skin and had: b' D% B% F! N# \7 D6 s% Q- t& i+ m4 S
been using protective clothing. A repeat testosterone
9 t2 t: _/ v: Ktest was ordered, but the family did not go to the
$ J8 T3 F6 B9 klaboratory to obtain the test.
: u1 R# `1 q7 |, GDiscussion
: r( E* Z; c% sPrecocious puberty in boys is defined as secondary
- v0 D/ ]# c# E1 Vsexual development before 9 years of age.1,4
# S& j3 J6 s2 S+ XPrecocious puberty is termed as central (true) when1 y9 P" H2 C0 L) k8 `' e2 a& r5 n
it is caused by the premature activation of hypo-
, E! R; | B! S$ l4 Vthalamic pituitary gonadal axis. CPP is more com-. M7 {" [$ h' }' G- m- s$ Y
mon in girls than in boys.1,3 Most boys with CPP
, L" V! E) D1 `2 [# P. p% w, O( r$ umay have a central nervous system lesion that is
6 u4 W0 T2 x# J6 F# c$ g0 tresponsible for the early activation of the hypothal-5 k3 t* I2 R) p# L( G* j7 V
amic pituitary gonadal axis.1-3 Thus, greater empha-# m5 O, d1 U! }4 Y% M
sis has been given to neuroradiologic imaging in
" }) S0 p' D2 _- y9 \boys with precocious puberty. In addition to viril-1 b! O! y0 o8 ~0 T! ~
ization, the clinical hallmark of CPP is the symmet-
/ c( W. n" w& b5 rrical testicular growth secondary to stimulation by
^5 @- |) W( q: |gonadotropins.1,3) A" r9 a, j$ q! b5 t! T# O
Gonadotropin-independent peripheral preco-
" G2 f" F8 W; Fcious puberty in boys also results from inappropriate4 l7 A. {' ?- i$ @* s
androgenic stimulation from either endogenous or, E! W6 P# M; ^ n
exogenous sources, nonpituitary gonadotropin stim-
" T% h9 ]- ^% d. pulation, and rare activating mutations.3 Virilizing: L, s. V- P: Y; Y' o$ f0 W
congenital adrenal hyperplasia producing excessive
0 N* F; l% V8 Padrenal androgens is a common cause of precocious/ X# N3 @" ]# B9 j9 M& C9 _
puberty in boys.3,4. B. O/ @" ^. l6 h+ R' h( H; W
The most common form of congenital adrenal, @& {7 S7 ^3 Q! p* M( c
hyperplasia is the 21-hydroxylase enzyme deficiency.
7 H8 E5 U6 a( n9 w, N/ P. jThe 11-β hydroxylase deficiency may also result in
( a% L: b. D0 Q( P Kexcessive adrenal androgen production, and rarely,# V$ d5 M5 `3 `2 D4 G
an adrenal tumor may also cause adrenal androgen
2 W+ y( l# x# i* e3 Texcess.1,31 ^. p! q3 z: c
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from7 ~, R7 g) |) K* g" q" I
542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
) J7 T1 F: x, j s1 m/ h$ eA unique entity of male-limited gonadotropin- N6 H: N; Y: f; w, [. Z/ j, Z! a
independent precocious puberty, which is also known
) u. ~3 j m/ V, m- a8 a: @8 ras testotoxicosis, may cause precocious puberty at a
0 Z3 o1 T+ C( ~5 y- `3 G2 S: ^very young age. The physical findings in these boys
6 o$ X: A# c! b: Vwith this disorder are full pubertal development,6 Z+ X2 r" F0 w
including bilateral testicular growth, similar to boys
% G! Y& _. I U' ]/ ]# P: ~; |with CPP. The gonadotropin levels in this disorder
8 y+ ]4 W6 M8 o0 p' Care suppressed to prepubertal levels and do not show9 X' M: G6 y/ N. A' S2 L0 {" i
pubertal response of gonadotropin after gonadotropin-
2 m4 `8 c/ y1 J/ [releasing hormone stimulation. This is a sex-linked6 L+ f9 j6 U# E5 W! W% Z
autosomal dominant disorder that affects only
/ Y. v) t5 u& L8 H! Wmales; therefore, other male members of the family/ o" p, W- ?$ m" ~
may have similar precocious puberty.3, k4 G5 g* u$ Q; V$ W
In our patient, physical examination was incon-
: w1 M1 i+ v: esistent with true precocious puberty since his testi-8 _5 P2 C' g7 ?3 d8 U: N
cles were prepubertal in size. However, testotoxicosis# r. I9 O# T# c0 t# i
was in the differential diagnosis because his father
2 ~* O- G/ ~* q$ J b4 D+ Ostarted puberty somewhat early, and occasionally,# M5 ]% s% m' t, h4 T1 P
testicular enlargement is not that evident in the
- Q0 V* G) F+ R3 L* q8 fbeginning of this process.1 In the absence of a neg-( _1 L2 N- d. ~* |7 o
ative initial history of androgen exposure, our0 P9 Z* w6 T+ I& I
biggest concern was virilizing adrenal hyperplasia,
7 X- y% y# g6 l0 yeither 21-hydroxylase deficiency or 11-β hydroxylase
! U- C9 @. C0 l- f: V, |1 h8 Gdeficiency. Those diagnoses were excluded by find-
3 j1 R4 L4 A' d: k9 Y6 K h1 }6 u Ning the normal level of adrenal steroids.: M+ B: L- U) t2 g# K
The diagnosis of exogenous androgens was strongly. @4 D5 D: P3 ?. n: h
suspected in a follow-up visit after 4 months because" D" U8 `) g; H, x& r8 W2 i
the physical examination revealed the complete disap-1 l/ s' n1 x0 n! z- y- O7 `' P
pearance of pubic hair, normal growth velocity, and
, \! i) k C4 D2 v. L# O% edecreased erections. The father admitted using a testos-
7 }* r0 Z1 o) H- L; Jterone gel, which he concealed at first visit. He was7 x) G" l4 Z4 o7 U% Y
using it rather frequently, twice a day. The Physicians’
) p/ V- c$ ~- U oDesk Reference, or package insert of this product, gel or
% F% O+ K( ^3 [3 z9 k2 \cream, cautions about dermal testosterone transfer to/ W) k' b* c4 G' E( G2 y
unprotected females through direct skin exposure.; D2 o$ J0 _+ l9 @
Serum testosterone level was found to be 2 times the
- U5 Z' |8 r+ x) Q# A& {baseline value in those females who were exposed to
+ m4 \7 b3 {+ D$ y( D% _6 _- \/ deven 15 minutes of direct skin contact with their male1 {; B! j! S% x* I! v3 N5 _
partners.6 However, when a shirt covered the applica-
* S/ e) Z& D- o; h* C& |tion site, this testosterone transfer was prevented.2 f$ z; f+ w0 j4 E9 X. T! }
Our patient’s testosterone level was 60 ng/mL,# L, S% ~4 u& W5 C3 A
which was clearly high. Some studies suggest that2 A% Y4 G$ I Z) q& x
dermal conversion of testosterone to dihydrotestos-
Y7 A2 H" C+ g+ q6 zterone, which is a more potent metabolite, is more/ P; c0 K0 m$ C- ?. C
active in young children exposed to testosterone/ P2 E) Z2 T- k4 K, m: o# U
exogenously7; however, we did not measure a dihy-& }7 D: a/ `% T P2 \
drotestosterone level in our patient. In addition to
# y9 g3 N* C, L+ b2 Cvirilization, exposure to exogenous testosterone in" `) ~# I/ F# H0 ]0 F4 Q0 a3 @
children results in an increase in growth velocity and5 v6 c* g0 T. F9 |7 z) w
advanced bone age, as seen in our patient.0 z: M, \. \, { \
The long-term effect of androgen exposure during
) Y# m8 v9 e9 `& Kearly childhood on pubertal development and final9 r! r' e0 n! N7 r5 }: p
adult height are not fully known and always remain' L% w$ z( Q% A8 {1 D6 a( _
a concern. Children treated with short-term testos-/ w( w/ t( {1 q- L& [) \7 [! I
terone injection or topical androgen may exhibit some
v: `" V9 l/ n; c, jacceleration of the skeletal maturation; however, after# p6 {, a/ o5 R' S1 I& m3 B
cessation of treatment, the rate of bone maturation
x( j9 S8 v) ]* N4 D" P$ U9 u2 hdecelerates and gradually returns to normal.8,9
. q7 o" y% W3 z2 A, {8 B- {% Y+ vThere are conflicting reports and controversy
" x9 l" p2 |( [* P& W! ~over the effect of early androgen exposure on adult. ?; `! W+ K1 t8 ~, W3 ^
penile length.10,11 Some reports suggest subnormal) d2 h' y8 {+ h; _
adult penile length, apparently because of downreg-
8 x) t! e, J& D Y8 yulation of androgen receptor number.10,12 However,# h+ k. Q/ D. k
Sutherland et al13 did not find a correlation between" ^; `6 ^" c x6 ]9 f
childhood testosterone exposure and reduced adult
; {+ y$ @9 r8 Ypenile length in clinical studies.
+ e7 ~; m/ g- i3 B9 D3 INonetheless, we do not believe our patient is
# ]+ i L- p4 f$ d# Pgoing to experience any of the untoward effects from
3 q, H5 s) }/ E# N* Y0 R5 \testosterone exposure as mentioned earlier because
+ R3 m0 @- `/ uthe exposure was not for a prolonged period of time.
6 j( Y) V, w2 c4 ]9 eAlthough the bone age was advanced at the time of
9 j# Z, q: e" gdiagnosis, the child had a normal growth velocity at
" }2 `, x3 Y$ X1 wthe follow-up visit. It is hoped that his final adult
3 s F: m+ L/ G' x5 Q& Oheight will not be affected.
6 r6 a2 K1 _) \9 |8 Z& o$ o SAlthough rarely reported, the widespread avail-" z/ Y4 {; ^$ s N$ d* Z
ability of androgen products in our society may
- w( F7 z4 R9 U$ n1 Nindeed cause more virilization in male or female. [% Z w% _3 v7 \5 b/ e
children than one would realize. Exposure to andro-
0 @: K+ H0 @$ t: @' D4 Hgen products must be considered and specific ques-6 y* i) \) I- U7 g O
tioning about the use of a testosterone product or0 a* b; h# }& Y! P4 X* B% D& V
gel should be asked of the family members during
% v" r% V4 b% r, Zthe evaluation of any children who present with vir-
4 {5 K8 U$ M |' nilization or peripheral precocious puberty. The diag-, f0 A5 @* V' y+ A8 _, x
nosis can be established by just a few tests and by
" ~8 s% u9 f5 {9 ?6 Zappropriate history. The inability to obtain such a
! N/ b( }1 |; a; j4 d& xhistory, or failure to ask the specific questions, may
) K. \: Y" d, G" x; u: e- `result in extensive, unnecessary, and expensive
, d* s ~! x* P e, x& Ninvestigation. The primary care physician should be
- Y# x: Y2 l& Q6 X: @1 @aware of this fact, because most of these children
! R6 T- x& \9 m5 bmay initially present in their practice. The Physicians’
/ Z8 @: |" m+ X8 Y: l, Z( GDesk Reference and package insert should also put a
8 ]; G: f* ~, y& cwarning about the virilizing effect on a male or
4 h* o" t8 x6 M1 Gfemale child who might come in contact with some-0 V3 W7 o v* }9 L
one using any of these products.; F) X$ {7 L5 T- X6 S/ |
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% F% \, H: D- z( t5 I1 k( C7. Klugo RC, Cerny JC. Response of micropenis to topical
5 k& R- t9 D! ?% ^4 g; H- Q% |( rtestosterone and gonadotropin. J Urol. 1978;119:
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9 P$ S6 k* t6 v3 z8. Guthrie RD, Smith DW, Graham CB. Testosterone5 c9 E- L; m3 `3 y: C& `
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